Process of removing or decreasing objectionable odors from treated oils



J. E. BOOGE.

PROCESS OF REMOVING 0R DECREASING OBJECTIONABLE ODORS FROM TREATED OILS.

APPLICATION FILED JUNE 13, 1918.

1 337 339 Patented Apr. 20, 1920.

ORNEY I ATT "UNITED STATES PATENT OFFICE;

JAMES ELIOT BOOGE, OF WILMINGTON, DELAWARE, ASSIGNOR TO E. I. DU PONT m: NEMOURS 8t COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

PROCESS OF REMOVING OR DECREASING OBJECTIONABLE ODOBS FROM TREATED OILS.

Specification of Letters Patent.

Patented Am. 20, 1920.

A lications-lea June 18, 1918. Serial mJzassoi.

-and in the State of DelaWare, have invented a certain new and useful Improvement in Processes of Removing or Decreasing Ohi jectionable Odorsfrom Treated Oils, and do .hereby declare that the following is a full,

process for removing or decreasing the 7 sult referred to.

clear, and exact description thereof.

My invention relates particularly to a odors-of partly oxidized or polymerized oils, and has application to-ve get'able or animal oils that have been treated, and which contain such-objectionable odors as well as the products thereof The object of my invention is to provid a process by means of which vegetable or animal oils which have been previously treated by blowing, oxidation orpolymerization, and which contain objectionable'odors, may be changed into oils substantially freed from such odors.

A further obj eat is to subject vegetable or animal oils of this character to a process in which a gas, such for exampleas an inert gas, may be introduced at an elevated temperature at atmospheric or less than atmospheric pressure in order to obtain the re- Further objects of my invention will appear from the" detailed description thereof contained hereinafter.

While my invention is capable of being carried out in many different ways, I shall describe only certain ways of carrying out the same hereinafter, and while it is'capable.

of being carried out in connection with many difierent types of apparatus, I shall describe only one type of apparatus for use in carrying out the same in the accompany drawings, in which;

have shown in diagrammatic view of an apparatus which may be used in accordance with my invention In the drawings I have shown a tank 1 having-a valved inlet pipe 2 for oil, and a valved outlet pipe 3 for the oil after having been subjected to my process. At the bottom of the tank 1' there is 'asteam heating coil 4 having a valved steaminlet pipe 5, and a valved steam outlet pipe 6. Near the bottom of the tank 1 there is furthermore a. perforated coil '7 having perforations 8 in the upper portion of the same to inject a current of gas, such for example as an inertgas or vapor into the oil, said coil 7 being supplied with said gas by means of a valved pipe 9. From the top of the tank 1 a vapor outlet pipe 10 leads to a vacuum pump 11 which has a pipe 12 leading to the outer air.

Said pipe 10 furthermore has a valved branch pipe 13 which may be used when it is not desired to use the vacugim pump 11..

In carrying out my process a quantity of partlyoxidized oil which may be any vegetable or animal oil, and which has been previously treated by blowing at an elevated temperature, or by oxidation with air' or oxygen in some manner other than blowing, as by exposure to the air of a fabric saturated with the oil, or by polymerization through the application of heat, and which oil may for example be cottonseed. oil, which the treatment, has through rancidity or otherwise acquired objectionable odors,

pipe 2. Such objectionable odors in the oils referred to often develop during the treatment to which they have been subjected, and such oils furthermore have a marked tendency to grow rancid when exposed to the air or light either alone or when mixed with other materials. By the treatment to which I now subject these oils the initial objec tionable odor as well as the odors which have been acquired through rancidity are greatly reduced or entirely removed. in order to accomplish this end the oil in the tank 1 is heated to a temperature of 120 C. by means of the steamcoil 4. Steam is then blown into the oil from the coil.'2' for approximately six hours, the temperature being maintained between 110'and 130 (1 During the treatment the vacuum pump 11 may-or may not be used as desired, but if it is used so as to obtain a vacuum of 25 in. oi.

mercury, a somewhat lower temperature is introduced into the tank 1 through the may be utilized in the tank 1, that is to say 105 C. The oil which has been subjected to this treatmentwill be found to have been substantially freed from the objectionable odors which are due in part to the presence of odorous volatile constituents, and if any odor is present only a faint oily odor will remain. The action of the injected steam is to reduce the partial pressure of the vapors ofthe volatile constituents by dilution with gas which is whamm re la thus promoting evaporation. By uti izing an in-.

er t-..gas further oxidation of the oil with reltn ig rancidit'y is avoided. It will"- be-fl'i'rfnderstood, however, that instead of injecting steam, other gases such as nitrogen, carbon dioxid etc., may be introduced. It will be understood also that many other oils may be used, as for e'xampleblown so' a bean oil.

ile -I have described my invention above in detail I wish it to be understood that many changes may be made therein without departin However, by t e term partly oxidized oils which I have used herein, I wish it to be understood that I mean only those vegetable or animal oils which have been blown,

oxidized or polymerized.

' ing blown cottonseed from the spirit thereof.

I claim;

1. The process which comprises subjecting blown cottonseed oilcontaming objectionable odors to blowing with steam at a temperature of. from 110 to 130 C. for about 6 hours under decreased pressure to decrease said odors thereof.

'2. The process which comprises subjectoil containing objectionable odors to blowing with steam at a. temperature-of from about 105 to 130 C. under decreased pressure to decrease said odors thereof.

In testimony that I claim the foregoing I have hereunto set 111 hand. JAME ELIOT BOOGE. Witnesses:

G. D. Horxms, STANLEY L. Anasus. 

